﻿// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
// Copyright (c) 2011, Dr. Masroor Ehsan
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
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//     * Redistributions in binary form must reproduce the above copyright
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//       derived from this software without specific prior written permission.
// 
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using FluentNHibernate.Cfg;
using MaxTrader.DAL.Mapping;
using MaxTrader.Persistence.Core;
using NHibernate;
using NHibernate.Cfg;
using NHibernate.Tool.hbm2ddl;

namespace MaxTrader.DAL
{
    public sealed class NHibernateHelper
    {
        private static ISessionFactory _factory;
        private static ISession _session;

        public NHibernateHelper(IPersistenceProvider persistenceProvider)
        {
            PersistenceProvider = persistenceProvider;
            _factory = Fluently
                .Configure()
                .Database(PersistenceProvider.Configuration)
                .Mappings(x => x.FluentMappings.AddFromAssemblyOf<MarketSectorMap>())
                .BuildSessionFactory();
        }

        internal static IPersistenceProvider PersistenceProvider { get; private set; }

        public static void CreateDatabase()
        {
            Fluently
                .Configure()
                .Database(PersistenceProvider.Configuration)
                .Mappings(x => x.FluentMappings.AddFromAssemblyOf<MarketSectorMap>())
                .ExposeConfiguration(BuildSchema)
                .BuildSessionFactory();
        }

        private static void BuildSchema(Configuration cfg)
        {
            var exp = new SchemaExport(cfg);
            exp.Drop(false, true);
            exp.Create(false, true);
        }

        internal static ISession OpenSession()
        {
            return _session ?? (_session = _factory.OpenSession());
        }

        internal static void CloseSession()
        {
            _session.Close();
        }
    }
}